Brooke Clarke wrote:
> Hi:
> 
> I had a need for a small low cost 5 Volt battery type power supply to 
> power some magnetic sensors in the field.
> To meet this need I've come up with what I call a Battery Top Power 
> Supply.  See:
> http://www.pacificsites.com/~brooke/PRC68COM.shtml#BTPS
> There are two versions, one uses any of the TO-92 packaged fixed voltage 
> regulator chips (9VF) and the other uses the LM317L adjustable regulator 
> chip (9VA).  They both sit on top of a 9 volt battery and are about the 
> same size as the top of the battery.
> 
> Also works great for powering proto boards when currents below 100 ma 
> are all that's needed.
> 
> Comments, suggestions?

Looks good, Brooke.

If there's much interest in it, you might also consider doing a switcher 
version.  I'm playing with some pic proto bds I bought from someone on 
this list 5 odd years ago.  I usually stick a 7805 on them to run from a 
12 volt gel cell or a 9 volt battery but a switcher would be nice to 
make the batteries last a bit longer.

If it was designed to handle inputs from 6 to 15 volts, it could find 
use in lots of systems.  The big question is how much current it should 
be good for.  I think it could be done fairly inexpensively... of 
course, that's an exercise left to the user (you)!

Good luck!
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